class Cistern::Hash
Public Class Methods
except(hash, *keys)
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@example
Cistern::Hash.except({ :a => 1, :b => 2 }, :a) #=> { :b => 2 }
@return [Hash] copy of {#hash} containing all keys except {#keys}
# File lib/cistern/hash.rb, line 14 def self.except(hash, *keys) Cistern::Hash.except!(hash.dup, *keys) end
except!(hash, *keys)
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Remove all keys not specified in {#keys} from {#hash} in place
@example
Cistern::Hash.except({ :a => 1, :b => 2 }, :a) #=> { :b => 2 }
@return [Hash] {#hash} @see {Cistern::Hash#except}
# File lib/cistern/hash.rb, line 24 def self.except!(hash, *keys) keys.each { |key| hash.delete(key) } hash end
slice(hash, *keys)
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@example
Cistern::Hash.slice({ :a => 1, :b => 2 }, :a) #=> { :a => 1 }
@return [Hash] copy of {#hash} containing only {#keys}
# File lib/cistern/hash.rb, line 7 def self.slice(hash, *keys) keys.each_with_object({}) { |e, a| a[e] = hash[e] if hash.key?(e) } end
stringify_keys(object)
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Copy {#hash} and convert all keys to strings recursively.
@example
Cistern::Hash.stringify_keys(:a => 1, :b => 2) #=> { 'a' => 1, 'b' => 2 }
@return [Hash] {#hash} with string keys
# File lib/cistern/hash.rb, line 34 def self.stringify_keys(object) case object when Hash object.each_with_object({}) { |(k, v), a| a[k.to_s] = stringify_keys(v) } when Array object.map { |v| stringify_keys(v) } else object end end